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Error: chart cannot save item after 10 attempts

My mini-web application is very small: reads SQL and displays charts based on the code of the element passed in the query string. It worked perfectly for several months, today I unexpectedly received an error message:

Server Error in '/' Application.
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Chart cannot save an item after 10 attempts.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.IOException: Chart cannot save an item after 10 attempts.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[IOException: Chart cannot save an item after 10 attempts.]
   System.Web.UI.DataVisualization.Charting.ChartHttpHandler.GetChartImageUrl(MemoryStream stream, String imageExt) +532
   System.Web.UI.DataVisualization.Charting.Chart.Render(HtmlTextWriter writer) +243
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +253
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +87
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +53
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +240
   System.Web.UI.Page.Render(HtmlTextWriter writer) +38
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4240

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Version Information: Microsoft .NET Framework Version:2.0.50727.4952; ASP.NET Version:2.0.50727.4955
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My database administrator helped me solve this problem. The hard disk ran out of free space, and the TempFolder needed for the diagrams was full, which prevents the diagrams from being saved there as described above.

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